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		x<sub>1</sub>
		+x<sub>2</sub>
		=y<sup>2</sup>
		<hr>
		<b>111</b>
		<i>111</i>
		<u>111</u>
		<s>111</s>
		<br>
		<strong>111</strong>
		<em>111</em>
		<ins>111</ins>
		<del>111</del>
		<hr >
		
		<pre>
		 |\ .             . /|
		._\\/             \//_.
		  ',\_,         ,_/,'
		    \.'         './
		    _\\/       \//_
		    '-.\,     ,/.-'
		       \\     //
		      _.-`"""`-._
		   ,-'-' _   _ '-'-,
		    '--\ o   o /'-'
		       |       |
		       |       |
		       /       \
		       |  \_/  |
		        \ _|_ /
		         '---'
		</pre>
		111
		111
		111
		<pre>
			111
			111
			111
		</pre>
		换行的标记是&lt;br&gt;
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